Well said Howard. We must not descend to the level of Isis and bay for blood.
Shamima hasn't (and I admit I'm assuming this, but it seems reasonable) physically undertaken terrorist activities. She has offered herself as a jihadi bride (as stated above). She has also been brought up by a radicalised father and been subjected to indoctrinating pressures.

I'd like to think that most British people would not be despising her, wanting to see her suffer or wish her ill.

We can adopt the moral high ground and show tolerance, sympathy and care. I'm old and have always thought of my country as made up of mild, tolerant and kind people. But sadly, this appears to be changing these days.